Level 4, Day 3 consists of 1 round of:

Tracking time per rep is really interesting. On Day 2, one takes two minutes rest between rounds. Comparing the time per rep on Day 2 to Day 3, it is very clear how much the rest helps; time per rep on Day 2 is slightly more than half the time on Day 3. Put another way, I go almost twice as fast on Day 2 as on Day 3, despite the fact that on Day 3 I am going absolutely all out to get the workout done in under five minutes.